Egyptian national flag

"Technically Ottoman sovereignty over Egypt proved only a minor
embarrassment when Britain and Turkey became enemies in First World
War; on 18 December 1914 a formal British protectorate over Egypt was
declared, followed by the deposition of the ruling khedive and the
transformation of his flag into an Egyptian national flag."

The revolution of 1919

image by Ivan Sache, 11 January 2004

"Agitation for independence began immediately, reaching a peak in
the Revolution of 1919. While the red flag with its white crescents
and stars was carried by Egyptians protesting British Rule, a special
banner was also seen in the streets. Its field was green and bore a
crescent and cross to show that both Muslims and Coptic Christians
supported the independence movement."